在英语中,above all和first at all有何区别?

above all表示某因素是最重要的,地位上是超越其他因素的.这些因素比较的性质更强一点.
first of all表示在众因素中(这些因素同等重要),该因素放在第一个说(而不一定是超越其他因素的).这些因素列举的性质更强一点.
自己体会一下吧.给两个例句:
1.He is a nice neighbour.He often helps us with garden work,and he is good at speech.Above all he is quite kind with people.
2.He is a nice neighbour.First of all he is quith kind with people.What's more,he often helps us with garden work and is good at speech.
除此之外,first of all必须在句首,且用逗号隔开.